e: Make a few renames on new dbusmenu API

e: Make a few renames on new dbusmenu API

typos:
 toogle -> toggle
 itens -> items

API consistency:
 MENU_ITEM_TOGGLE -> E_DBUSMENU_ITEM_TOGGLE
 E_DBus_Menu_Item_Event -> E_DBusMenu_Item_Event
 	(I don't want to bikeshed on this, but we need to choose one of the
	 possible names, and keep consistent with the rest of the API)

A few var renames: It's E_DBusMenu_Ctx, so let's name the var ctx
instead of menu_data. internal_ctx is no more meaninful than ctx, so
rename it as well.

SVN revision: 82092